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Don't dereference a free()ed pointer.

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Closes PR bin/1909: 'last' coredumps if MALLOC_OPTIONS...
This commit is contained in:
Joerg Wunsch 1996-10-28 07:47:34 +00:00
parent b36b7d853f
commit 19bb578358
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=19223
1 changed files with 5 additions and 3 deletions
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8
usr.bin/last/last.c
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@ -162,7 +162,7 @@ void
wtmp()
{
struct utmp *bp; /* current structure */
struct ttytab *tt; /* ttylist entry */
struct ttytab *tt, *ttx; /* ttylist entry */
struct stat stb; /* stat of file for size */
long bl, delta; /* time difference */
int bytes, wfd;
@ -191,9 +191,11 @@ wtmp()
*/
if (bp->ut_line[0] == '~' && !bp->ut_line[1]) {
/* everybody just logged out */
for (tt = ttylist.lh_first; tt; tt = tt->list.le_next) {
for (tt = ttylist.lh_first; tt;) {
LIST_REMOVE(tt, list);
free(tt);
ttx = tt;
tt = tt->list.le_next;
free(ttx);
}
currentout = -bp->ut_time;
crmsg = strncmp(bp->ut_name, "shutdown",